Lamp discharge lighting device power inverter
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United States of America Patent
Stats
-
Mar 14, 2000
Grant Date -
N/A
app pub date -
Dec 22, 1997
filing date -
Dec 25, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power supply device and a discharge lamp lighting device which are capable of reducing high harmonic elements and improving a crest factor. A full-wave rectifying circuit is connected to a commercial AC power supply. A first capacitor, a diode and second capacitor, having a smaller capacitance than the first capacitor, are connected to the full-wave rectifying circuit. A partially smoothed circuit consisting of a charge capacitor, an inductor and a diode is connected to the second capacitor. A parallel resonance circuit and a collector-emitter of a transistor are connected to the partially smoothed circuit. The parallel resonance circuit consists of a primary winding of an inverter transformer and a first resonance capacitor. A second resonance capacitor is connected between the emitter and the collector of the transistor. Filaments of a fluorescent lamp are connected to a secondary winding of the inverter transformer. A starting capacitor is connected to the filaments.
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